In windows 7,if you want to take ownership of a file or folder,you need to do many step or commands.But you can follow the below steps to add take ownership to right click menu so that you can take ownership of file or folder easily.
1.Download the following zip file,unzip it then double click file AddTakeOwnership.reg , click through the prompts
2.Now in your right click menu you can see Take Ownership there. See below screenshot.
3.Optional,if you want to remove Take Owership from your right click menu,just double click DeleteTakeOwnership.reg
Note: Do NOT take ownership of files or foders under C:\Windows.